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【简答题】
某溶液中含0.5mol·L -1 NH 3 ·H 2 O与0.1mol·L -1 的[Cu(NH 3 ) 4 ] 2+ ，已知 [Cu(OH) 2 ]=2.0×10 -20 ， (NH 3 ·H 2 O)=1.8×10， {[Cu(NH 3 ) 4 ] 2+ }=4.8×10 12 。通过计算说明该溶液中是否会产生沉淀。
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